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Chemistry - Redox Reactions

Practise 43 COMEDK previous year questions on Redox Reactions, compiled from papers spanning 2012 to 2026. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty COMEDK tests.

Redox Reactions has been asked in 14 of the 15 years of COMEDK papers analysed (2012–2026), with 43 questions in all. 26% of them were easy, 67% moderate and 7% tough. Most of its questions came from 2024, with 12 questions that year. In the last three years (2024–2026) it had 24 questions across 10 papers, about 2.4 per paper.

The chapter's 6 topics are not weighted equally: Oxidation and Reduction Reactions (10 questions, 23%), Oxidation number (9 questions, 21%), and Balancing of redox reactions (7 questions, 16%) have been asked the most. Oxidation and Reduction Reactions has also led over the last five years, with 8 questions. Balancing of redox reactions has produced the most tough questions (1).

  1. 1In the reaction, The change in oxidation state of Cr is:09 May, 2026 (S1)Oxidation number
  2. 2x moles of K Cr O oxidises 1 mole of ferrous oxalate, in acidic medium. Hence 'x' is:09 May, 2026 (S2)Oxidation number
  3. 3In the redox reaction, taking place in acidic medium: , the ratio of X:Y in a stoichiometrically balanced equation will be09 May, 2026 (S2)Balancing of redox reactions
  4. 4Which among the following species does not exhibit disproportionation reaction?25 May, 2025 (Shift)Types of redox reactions
  5. 5For the reaction, Find and25 May, 2025 (Shift)Balancing of redox reactions
  6. 6Choose the correct statement.10 May, 2025 (S1)Oxidation and Reduction Reactions
  7. 7Which one of the following options represents the decreasing order of oxidation number of the central atom in:10 May, 2025 (S1)Oxidation number
  8. 8The concentration and percentage purity of Oxalic acid can be determined by titration with in presence of dil. . Instead of dil. , dil HCl c10 May, 2025 (S1)Redox titration
  9. 9Given below are 2 statements: one Assertion and the other Reason. Which one of the following options is correct? Assertion: Sulphur dioxide 10 May, 2025 (S2)Oxidation and Reduction Reactions
  10. 10The oxidation number of potassium in and respectively are:10 May, 2025 (S3)Oxidation number
  11. 11Identify the correct coefficients (a), (b), (c) and (d) in the following equations i) (a) (b) (a) (c) ii) (c) (d) (d) (b)10 May, 2025 (S3)Balancing of redox reactions
  12. 12An example of disproportionation reaction is:10 May, 2025 (S3)Types of redox reactions
  13. 13In the reaction,2024 (Afternoon Shift)Oxidation and Reduction Reactions
  14. 14When of Mohr salt is dissolved in of water, and titrated against solution, of this solution required of for complete oxidation. The strength2024 (Afternoon Shift)Equivalence concept
  15. 15Identify the oxidation reaction in which acidified is required2024 (Afternoon Shift)Oxidation and Reduction Reactions
  16. 16In the redox reaction between and sulphite ion, what is the number of moles of electrons involved in producing 3.0 moles of the oxidised pro2024 (Evening Shift)Oxidation number
  17. 17The equivalent weight of potassium permanganate in acid solution is2024 (Memory Based)Equivalence concept
  18. 18In the given reaction below, the coefficient of is2024 (Memory Based)Balancing of redox reactions
  19. 19How many grams of potassium dichromate are required to oxidise 20.0 g of in to if the reaction carried out in an acidic medium? Molar mass o2024 (Memory Based)Balancing of redox reactions
  20. 20Name of the gas that can readily decolourise acidified solution is2024 (Memory Based)Oxidation and Reduction Reactions
  21. 21When a colourless gas is passed through bromine water only decolourisation take place. The gas is2024 (Memory Based)Oxidation and Reduction Reactions
  22. 22-pentane and isopentane can be distinguished by2024 (Memory Based)Oxidation and Reduction Reactions
  23. 23An inorganic salt comprises of atoms of elements and . If the oxidation numbers of A, B and are and 2 respectively, what is the possible for2024 (Morning Shift)Oxidation number
  24. 24Choose the group of ions / molecules in which none of the species undergo Disproportionation reaction.2024 (Morning Shift)Types of redox reactions
  25. 25In the given Redox equation, identify the stoichiometric coefficients and .2023 (Evening Shift)Balancing of redox reactions
  26. 26acts as an oxidising agent in acidic medium. The number of moles of that will be required to react with one mole of oxalate ions (to form ) 2022Oxidation and Reduction Reactions
  27. 27The colour of changes to is2022Redox titration
  28. 28Which of the following gas readily de-colourises the acidified solution?2022Redox titration
  29. 29For decolourisation of 1 mole of , the moles of required is2021Redox titration
  30. 30In the ionic equation, the value of is2020Balancing of redox reactions
  31. 31When is dissolved in water, ions are2020Oxidation and Reduction Reactions
  32. 32Carbon forms two oxides which have different compositions. The equivalent mass of which remains constant?2020Equivalence concept
  33. 33of an acid is neutralised by of . The equivalent mass of the acid is2019Equivalence concept
  34. 3450 ec of oxalic acid is oxidised by 25 cc of . The mass of oxalic acid present in 500 ce of the solution is2019Redox titration
  35. 35In the titration of mohr salt against , the indicator used is2019Redox titration
  36. 36of Mohr salt solution is oxidised by of in acid medium. The mass of Mohr's sallt present in 500 cc is2019Redox titration
  37. 37In the conversion of to , the oxidation number of Br changes from2018Oxidation number
  38. 38When sulphur dioxide is passed in an acidified solution, the oxidation state of sulphur is changed from2017Oxidation number
  39. 394 g of copper was dissolved in concentrated nitric aci(d) The copper nitrate solution on strong heating gave of its oxide. The equivalent we2016Equivalence concept
  40. 40The non-existence of and is due to2014Oxidation and Reduction Reactions
  41. 41Which of the following species do not show disproportionation reaction?2014Types of redox reactions
  42. 42The equivalent weight of a certain trivalent element is . Molecular weight of its oxide is2013Equivalence concept
  43. 43The oxidation number of oxygen is in2012Oxidation number

Frequently Asked Questions

1.How many questions are available for Redox Reactions?

This chapter includes 43 questions compiled from COMEDK papers spanning 2012 to 2026.

2.Are these questions only from COMEDK, or from other exams too?

These are COMEDK questions specifically for the Redox Reactions chapter. Questions from other exams like JEE Main or NTA Abhyas (JEE Main) are organised separately under their respective exam sections.

3.Is Redox Reactions an important chapter for COMEDK Chemistry?

Redox Reactions has appeared in 14 of the 15 years of COMEDK papers covered here, with 43 questions across 21 papers - about 2 per paper it appears in.

4.What is the difficulty level of Redox Reactions questions in COMEDK?

Of the 43 questions analysed for this chapter, 26% are easy, 67% moderate and 7% tough. 2024 had the most, with 12 questions.

5.Which topics in Redox Reactions should I focus on?

These topics have carried the most weightage in Redox Reactions:

  • Oxidation and Reduction Reactions - 10 questions (23%)
  • Oxidation number - 9 questions (21%)
  • Balancing of redox reactions - 7 questions (16%)
  • Balancing of redox reactions has produced the most tough questions (1).
6.Is Redox Reactions's weightage in COMEDK going up or down?

Across all 21 papers analysed, Redox Reactions has averaged about 2.0 questions per paper. In the last three years (2024–2026), that average has risen, at about 2.4 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.